The annual march marks the anniversary of the Supreme Court’s Roe v. Wade decision, and also coincides with the Republican National Committee’s winter meeting in D.C.

Despite the labels of “progressive” and “liberal” the pope have been given by some, his tweet reflects his past position on abortion, and is in line with the teachings of the Catholic church. Last year, the pope criticized those who saw abortion as “progressive” and, earlier this month, Francis compared abortion to the discarding of “dispensible objects.”

“Unfortunately, what is thrown away is not only food and dispensible objects, but often human beings themselves, who are discarded as ‘unnecessary,’” Francis said during his annual papal “state of the world” speech. “For example, it is frightful even to think there are children, victims of abortion, who will never see the light of day.”